Unable to run `nix develop`

[Jeremy Cantrell]

I get the following warning when running nix develop:

error: hash mismatch in fixed-output derivation '/nix/store/c7zzc9z2qn2958y9xb2cq2k9z9lpcyb7-channel-rust-stable.toml.drv':
         specified: sha256-+EFKtTDUlFY0aUXdSvrz7tAhf5/GsqyVOp8skXGTEJM=
            got:    sha256-MJyH6FPVI7diJql9d+pifu5aoqejvvXyJ+6WSJDWaIA=

[Newton Migosi]

got the same error when doing nix develop

[Peter Becich]

this should fix it: #44